package com.peng._05weibo.common.interceptor;

import com.peng._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 用户登录拦截器
 * @Author peng
 * @Date 2024-04-28 15:05
 */
@Slf4j
public class UserLoginInterceptor implements HandlerInterceptor {
    /**
     * 登录状态校验拦截器
     * @return true-校验通过、继续执行，false-校验失败、重定向到登录页面
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.debug("UserLoginInterceptor拦截器开始工作...");
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        if (userVO == null){
            // 未登录，跳转到登录页面
            log.debug("用户未登录，即将跳转到登录页面...");
            response.sendRedirect( "/login.html");
            return false;
        } else {
            // 已登录，继续执行
            log.debug("用户登录校验通过，继续执行...");
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
